Charm is a python based software to write, postpone and send post to blogs.
it works well with livejournal and wordpress. but I haden't succeed to make it work with blogger (maybe need some more time to fix it... ?)
And the great thing about charm is that you can use your favourite text editor (vim, emacs, or any others ...)
Due to the pyhton language, it works under Mac OS X, Linux, and M$-Windows.
here the links :
feedparser is a python module to make charm works.
(it works perfectly under eeepc :p )